feat(20-02): add template hint quick-fill chip to PreparePanel

- DocumentPageClient fetches /api/documents/:docId/fields on mount and aiPlacementKey change
- Derives selectedFieldHint from selected field's hint property
- Passes selectedFieldHint prop to PreparePanel
- PreparePanel renders Template Hint chip in Quick Fill section when hint exists

teressa-copeland-homes/src/app/portal/(protected)/documents/[docId]/_components/DocumentPageClient.tsx

@@ -2,7 +2,7 @@
 import { useState, useCallback, useEffect } from 'react';
 import { PdfViewerWrapper } from './PdfViewerWrapper';
 import { PreparePanel } from './PreparePanel';
-import type { DocumentSigner } from '@/lib/db/schema';
+import type { DocumentSigner, SignatureFieldData } from '@/lib/db/schema';
 
 interface DocumentPageClientProps {
   docId: string;
@@ -34,6 +34,7 @@ export function DocumentPageClient({
   const [selectedFieldId, setSelectedFieldId] = useState<string | null>(null);
   const [textFillData, setTextFillData] = useState<Record<string, string>>({});
   const [aiPlacementKey, setAiPlacementKey] = useState(0);
+  const [fields, setFields] = useState<SignatureFieldData[]>([]);
 
   // Auto-seed signers from client contacts when no signers have been configured yet
   const defaultSigners: DocumentSigner[] = initialSigners.length > 0
@@ -45,6 +46,14 @@ export function DocumentPageClient({
   const [signers, setSigners] = useState<DocumentSigner[]>(defaultSigners);
   const [unassignedFieldIds, setUnassignedFieldIds] = useState<Set<string>>(new Set());
 
+  // Fetch fields so we can derive hint for the selected field
+  useEffect(() => {
+    fetch(`/api/documents/${docId}/fields`)
+      .then(r => r.json())
+      .then((data: SignatureFieldData[]) => setFields(Array.isArray(data) ? data : []))
+      .catch(() => {});
+  }, [docId, aiPlacementKey]);
+
   // Persist auto-seeded signers to DB so they survive refresh
   useEffect(() => {
     if (initialSigners.length === 0 && defaultSigners.length > 0) {
@@ -89,6 +98,10 @@ export function DocumentPageClient({
     setPreviewToken(null);
   }, [docId]);
 
+  const selectedFieldHint = selectedFieldId
+    ? fields.find(f => f.id === selectedFieldId)?.hint
+    : undefined;
+
   return (
     <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
       <div className="lg:col-span-2">
@@ -119,6 +132,7 @@ export function DocumentPageClient({
           textFillData={textFillData}
           selectedFieldId={selectedFieldId}
           onQuickFill={handleQuickFill}
+          selectedFieldHint={selectedFieldHint}
           onAiAutoPlace={handleAiAutoPlace}
           signers={signers}
           onSignersChange={setSigners}

teressa-copeland-homes/src/app/portal/(protected)/documents/[docId]/_components/PreparePanel.tsx

@@ -95,6 +95,7 @@ interface PreparePanelProps {
   textFillData: Record<string, string>;
   selectedFieldId: string | null;
   onQuickFill: (fieldId: string, value: string) => void;
+  selectedFieldHint?: string;
   onAiAutoPlace: () => Promise<void>;
   // Multi-signer props — wired in Phase 16 Plan 01, consumed here in Plan 02
   signers?: DocumentSigner[];
@@ -112,6 +113,7 @@ export function PreparePanel({
   agentDownloadUrl, signedAt, clientPropertyAddress,
   previewToken, onPreviewTokenChange,
   textFillData, selectedFieldId, onQuickFill,
+  selectedFieldHint,
   onAiAutoPlace,
   signers = [],
   onSignersChange,
@@ -346,6 +348,16 @@ export function PreparePanel({
               <span className="text-xs text-gray-400 block">Client Email</span>
               <span className="truncate block">{defaultEmail}</span>
             </button>
+            {selectedFieldHint && (
+              <button
+                type="button"
+                onClick={() => onQuickFill(selectedFieldId, selectedFieldHint)}
+                className="w-full text-left px-3 py-2 text-sm border rounded bg-white hover:bg-blue-50 hover:border-blue-300 transition-colors"
+              >
+                <span className="text-xs text-gray-400 block">Template Hint</span>
+                <span className="truncate block">{selectedFieldHint}</span>
+              </button>
+            )}
           </div>
         ) : (
           <p className="text-sm text-gray-400 italic">